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I'd just drop them in with your soft lead, it wouldn't hurt to dunk them first in a solution of baking soda to neutralize any acid.

It's not the years in your life that count. It's the life in your years (Abe Lincoln)

"A free people ought not only to be armed and disciplined, but they should have sufficient arms and ammunition to maintain a status of independence from any who might attempt to abuse them, which would include their own government.” George Washington

check it too, found a few zinc terminals in a big batch I got from a scrap yard. luckily I was smelting at a low temp because I had other unknown stuff I was melting, out of 30 terminals about 5 would not melt and I threw them out.

Don like the others have said, the ones I've had were predominantly soft lead.
an easy test is to nip them with a pair of side cutters and if they cut easily they are lead.
merlin101 is right about safety, make sure you don't breathe the fumes while smelting.
If the terminals are still connected to the copper, you can swap that for lead at your scrap yard (sell and buy)

Battery posts are dead soft. The cable ends can be hard or soft. The large factory terminals like you find on a diesel pickup are soft and the cheaper terminals like you find at the O'reilys can be either way.

OK, so John says that they are hard as clip-ons, the others that they are soft as stick-ons...

Originally Posted by lwknight

Battery posts are dead soft. The cable ends can be hard or soft. The large factory terminals like you find on a diesel pickup are soft and the cheaper terminals like you find at the O'reilys can be either way.

Just to clarify a bit more, that 255 lb batch that I did was ALL scrap cable ends pulled off recent model junk cars, 99% of them were factory ends, and this recycler is processing mostly passenger cars, but also some SUVs and light trucks. There were no battery posts in the batch. I don't know about "aftermarket" cable ends, There were only a couple in that batch.

Every time I cast a batch of boolits from that Batch of Battery term alloy, I measure hardness and it has always been in the range of COWW. I am quite confident in my readings.

I've got about a gallon can of mixed cable ends. They are a real mix, everything from heavy equipment to the cheap after market replacement ends. I plan to test each one with acid and then smelt them together. Then I'll drop an ingot or two into each batch of wheelweights.